<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
textarea {margin:0;padding:0;width:100px; height:400px; vertical-align:top;}
div {height:300px; width:100px; background:yellow;border:1px solid red;}
</style>
</head>
<textarea></textarea>
<div></div>
<body>
</body>
</html>
